FIBER LASERS

Coupling efficiency of angle-polished method for side-pumping technology

[+] Author Affiliations
Pan Ou, Ping Yan, Mali Gong, Wenlou Wei

Tsinghua University, Center for Photonics and Electronics, Department of Precision Instruments, Beijing 100084, China E-mail: opp00@mails.tsinghua.edu.cn

Opt. Eng. 43(4), 816-821 (Apr 01, 2004). doi:10.1117/1.1666855
History: Received May 19, 2003; Revised Oct. 16, 2003; Accepted Oct. 23, 2003; Online March 31, 2004
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The angle-polished method for side-pumping technology that is useful in high-power fiber lasers and fiber amplifiers is investigated. By geometric optics, the simple model for calculation of the coupling efficiency is derived. Numerical simulations show that both the polished angle of multimode fiber and the refractive index of index-matching material are pivotal to the side-coupling efficiency. By experiments, coupling efficiency of 80.2% and maximum coupling power of 1.12 W are measured for a 200-μm multimode fiber and a double-clad fiber with a 400/340-μm D-shaped inner cladding. Slope efficiency of 56% and output power of 282 mW are demonstrated in a D-shaped Yb-doped double-clad fiber laser by the side-pumping system with the angle-polished method. © 2004 Society of Photo-Optical Instrumentation Engineers.

© 2004 Society of Photo-Optical Instrumentation Engineers

Citation

Pan Ou ; Ping Yan ; Mali Gong and Wenlou Wei
"Coupling efficiency of angle-polished method for side-pumping technology", Opt. Eng. 43(4), 816-821 (Apr 01, 2004). ; http://dx.doi.org/10.1117/1.1666855


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